HP LaserJet Enterprise MFP M527

Use the following procedure to troubleshoot power on problems.

1. Verify that power is available to the printer. If the printer is plugged into a surge protector or uninterruptible power supply (UPS), remove it, and then plug the printer directly into a known operating wall receptacle (make sure that the wall receptacle provides the correct voltage and current for the printer). Unplug any other devices on the same circuit that the printer is using.
2. Try another known operating wall receptacle and a different power cord.
3. Listen for startup noises (for example, fans or motors) and look for illuminated lights on the control panel and formatter LEDs.
   NOTE: Operational fans, motors, and control-panel lights indicate the following:
   • AC power is present at the printer.
   • The power supply is providing either or both 24 Vdc and 5 Vdc voltages.
   • The DC controller microprocessor is functioning.
4. Check the following:
   a. Turn the printer on, and then listen for startup noises. If normal startup noises are heard, go to step c below.
   b. If normal startup noises are not heard, turn the printer off, and then remove any installed accessories (for example, envelope feeders, paper feeders, or output accessories). Turn the printer on, and then listen for startup noises. If normal startup noises are heard, the problem might be with one of the accessories
   c. Turn the printer off and then remove the power connector from the formatter. Turn the printer on, and then use a small pointed object (like a paper clip) to depress the test-page switch located on the rear side of the printer (near the formatter).
   NOTE: The test page can only use Tray 2 as the paper source, so make sure that paper is loaded in Tray 2.
   d. If the engine test page prints, the print engine is operating normally. Replace the formatter. NOTE: M506/E50045/M507/E50145 (all) and M527dn/E52545dn/M528dn/E52645dn models only: If the engine test page does not print, turn the printer off, remove the embedded MultiMedia Card (eMMC), and then try the engine test again. If the page prints, the problem might be the eMMC.
   e. If after replacing the formatter normal startup noises are still not heard, replace the DC controller. NOTE: If the error persists after replacing these assemblies, escalate the problem to the Global Business Unit (GBU).